All we have to do is to install the CSS pre-pocessor we want and Vite will then use it, see [Vite Docs - CSS pre-processors](https://vitejs.dev/guide/features.html#css-pre-processors).

Example:
 - [github.com/brillout/vite-plugin-ssr-sass](https://github.com/brillout/vite-plugin-ssr-sass)
